Chuck.



G. K. ATKINSON.

CHUGK.

APPLICATION FILED MAY 27, 1911. 1,049,973. Patented Jan. '7, 1913.

3 SHEET$-SHEET 1. 7"" 0 Q vi/bmeooeo coumnm. PLANOGRAPI] co, WASHINGTON, 1) c.

G. K. ATKINSON.

CHUCK.

APPLICATION FILED MAY 27, 1 911. 1 ()4 9 973 Patented Jan. '7, 1913.

3 SHEETS-SHEET 2.

GEORGE K. ATKINSON, OF CINCINNATI, OI-IIO.

CHUCK.

Specification of Letters Patent.

Application filed May 27, 1911.

Patented Jan. '7, 1913. Serial No. 629,821.

To all whom it may concern:

Be it known that I, GEORGE K. ATKINSON, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Chucks, of;

which the following is a specification.

My invention relates to certain new and useful improvements in chucks, and the object of my invention is to produce a chuck which is simple and positive in operation and one which will have a wide range of adjustment and which can be opened and closed without the necessity of stopping the machine on which it is used.

IVith these and other objects in view my invention consists in certain constructions,

combinations and arrangements of parts, the preferred form of which will be first described in connection with the accompanying drawings and then the invention particularly pointed out in the appended claims.

Referring to the drawings wherein the same part is designated by the same reference numeral wherever it occurs, Figure 1 is a perspective view of a portion of one end of the screw machine provided with my improved chuck; Fig. 2 is a side elevation of the preferred form of my chuck with the interior parts shown in dotted lines; Fig. 3 is a central longitudinal section of Fig. 2; Fig. 4: is a section taken on line at, 4 of Fig. 2, looking in the direction of the arrow; Fig. 5 is a section taken on line 5, 5 of Fig. 2, looking in the direction of the arrow, and Fig. 6 is a detached perspective view of the actuating cams and mechanism for actuating the same.

In order to illustrate one form of my invention I have shown the same as mounted upon the hollow shaft 10 of a screw machine, the end of the shaft being shouldered and threaded as indicated at 11, and on which is secured the inner end of the cylindrical chuck body 12. The interior of the body portion 12 is provided with a plurality of cam surfaces 13, three being shown which cooperate with the gripping rolls 14 to cause the rolls to grip the work or tool 15. These cam surfaces are eccentrically disposed and each terminates in a more or less abruptly inturned portion 13.

16 designates a cage for the gripping rolls 14, said cage being mounted within the chuck body 12, the base 17 of the cage seating on a bearing portion 18 in the chuck body. The forwardly extendingportions 19 of the cage form longitudinally extending slots in which the gripping rolls 1 1 are seated, the diameter of said rolls being somewhat greater than the thickness of the portions 19, whereby their peripheries will project slightly beyond the wall of the cage to bear on the cam faces 13, whereby said rolls will be moved inward by a relative rotatory movement between the cage and the chuck body.

20 is a face plate secured to the front of the chuck body by means of the screws 21, whereby the rolls are held in position in the cage and prevented from longitudinal movement therein. The plate 20 is provided with a central opening 22 for the insertion of the work or tool into the gripping jaws formed by the rolls.

The base 17 of the cage is provided, preferably only part way around its periphery, with gear teeth 23 with which the worm 24 mounted in the chuck body 12 is adapted to engage. The inner end of the worm 2 1 is secured in suitable thrust-bearings 25 while its outer portion is tapered at 26 and on which tapered portion is secured a gear 27 by means of a lock nut 28. Preferably the outer end of the worm is squared as shown at 29 to provide means for rotating the worm when the gear 27 has been loosened from the worm by the nut 28, so that the initial position of the rolls on the cam surfaces can be raised as desired. Mounted in a guide way 30 in the chuck body 12 is a rack 31, meshing with the gear 27. This rack is secured to a cylinder 32 surrounding the chuck body 12, whereby upon sliding the cylinder 32 longitudinally of the chuck body the worm 24 will be actuated through the rack 31 and the gear 27 rotating the cage 19 and causing the gripping rolls 141 to be actuated by the cams 13.

I have shown the cylinder 32 as being provided with a groove 33 in which is mounted a collar 34, said collar being provided with a pair of trunnions 35 engaged by the end of a fork 36 mounted upon a rock shaft 37,

provided with an operating lever 38, whereby the operation of the lever will slide the cylinder 32 upon the chuck body and actuate the gripping rolls as just described.

From the foregoing construction it will be seen that the gripping rolls can be actuated to engage or release the tool or work without stopping the machine upon which the chuck is mounted, and that by cutting the gear 23 of sufficient length the limit of the throw of the gripping rolls when actuated by the re ciprocation of the cylinder 82 can be adjusted so as to accommodate pieces of different diameters that vary from each other by more than the movement of the rolls produced by the reciprocation of the cylinder 82.

I realize that considerable variation is possible in the details of construction and arrangement of parts without departing from the spirit of my invention, and I there fore do not intend to limit myself to the specific form shown and described.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a chuck the combination with a chuck body having a recess formed with a plurality of cam surfaces, a cage provided with a base portion seated in the recess and a forwardly extending portion provided with longitudinal slots, said base portion having gear teeth out thereon, gripping rolls mounted in said slots and contacting with said cam surfaces, a worm engaging the gear teeth on the base of the cage, a gear on said worm, a rack slidably mounted on the chuck body and engaging the gear, and means for reciprocating said rack.

2. In a chuck the combination with a chuck body having a recess formed with a plurality of cam surfaces, a cage provided with a base portion seating in the recess the forwardly extending portion of the cage being provided with longitudinal slots, gripping rolls mounted in the slots, a cylinder slidably mounted on the chuck body, means for moving the cylinder longitudinally of the chuck body, a worm mounted in the chuck body and engaging the gear teeth on the base of the cage, a gear adjustably mounted on the worm, and a rack carried by the cylinder and engaging the gear.

In testimony whereof I aiiix my signature in presence of two witnesses.

G. K. ATKINSON.

Witnesses:

GEORGE E. \VnLLs, JosnrH L. LOGAN.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of ratents. Washington, D. G. 

